time and work question solution- A can do a piece of work in 20 days .which B can do in 12 days B worked at it for 9 days a can finish the remaining work in?

A very famous time and work question is as follows-

a can do a piece of work in 20 days .which B can do in 12 days.B work that it for 9 days .a can finish the remaining work in?-

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